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calculeaza
400+480:4 - [680:2+4 x (20+12+ 18)]=
[84 + (630 : 6 x4) - (312 : 8 x2 )- 298] :(8 x 864 : 108) =
101- 300: [ 24- 21: (42-18 : 3-180 :12) + 196 :28] =